java - play.data.Form<> not filling j.u.Map<> fields when deserializing request body into object -

i form in playframework have noticed strange when have class has field map<>

import org.codehaus.jackson.annotate.jsonignoreproperties; import org.codehaus.jackson.annotate.jsonproperty; import org.codehaus.jackson.annotate.jsonsetter; import org.codehaus.jackson.map.annotate.jsondeserialize;  import java.util.hashmap; import java.util.linkedhashmap; import java.util.map;  @jsonignoreproperties(ignoreunknown = true) public class gamestate {      private string roomid = "";      private string woohoo = "";      @jsondeserialize(as = linkedhashmap.class, contentas = integer.class, keyas = string.class)     private map<string, integer> players = new hashmap<string, integer>();       @jsonproperty("players")     public map<string, integer> getplayers() {         return players;     }      @jsonsetter("players")     public gamestate setplayers(map<string, integer> players) {         this.players = players;         return this;     }      public string getroomid() {         return roomid;     }      public gamestate setroomid(string roomid) {         this.roomid = roomid;         return this;     }      public string getwoohoo() {         return woohoo;     }      public gamestate setwoohoo(string woohoo) {         this.woohoo = woohoo;         return this;     } } 

in controller have following static form:

static form<gamestate> gameform = new form<gamestate>(gamestate.class); 

and have following action:

@bodyparser.of(bodyparser.json.class) public static result testaction() {     form<gamestate> form = gameform.bindfromrequest();     if (!form.haserrors()) {         gamestate s = form.get();         if (!s.getplayers().isempty()) {             return ok();         } else {             return badrequest("need players!");         }     } else {         return badrequest("wrong format!");     } } 

this de-serialize other field (list<> , set<> included when had classes such fields) not map<> fields. strange thing works for:

gamestate s = json.fromjson(request().body().asjson(), gamestate.class); 

here curl call use test action

curl -x post http://localhost:9000/game/end/1 --data '{"roomid": "someid", "woohoo": "something", "players" : { "oliver" : "0" } }' -h 'content-type: application/json' 

i using play 2.1. not seem matter if have @bodyparser.of() or not on action.

question : there way make form.get() work properly?